Having a tendency to grumble; somewhat grumpy or prone to complaining.
Formed from grumble with the -y suffix, creating an adjective that means 'having the quality of' or 'inclined toward.' This is a straightforward, informal adjective formation.
The -y suffix transforms verbs into casual, conversational adjectives—compare 'grumbly' with 'inclined to grumble'; the first feels like something a friend would say, the second sounds formal and distant.
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